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What does the Q_OBJECT macro do? Why do all Qt objects need this macro?
... use the signal/slot mechanism. The absence of Q_OBJECT breaks the qobject_cast and introspection. It can lead to some perplexing behavior, so it's a bad idea.
– Unslander Monica
Apr 7 '16 at 20:39
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Code Golf - π day
...as to see how many stars we need to print for this line.
# Bitwise OR "casts" to int; and: 1 | int(2 * x) == 1 + 2 * int(x)
my $stars = 1 | 2 * sqrt($radius**2-$y**2);
$surface += $stars;
# $" = $LIST_SEPARATOR: default is a space,
# Print indentation + stars
# (newline...
Difference between exit() and sys.exit() in Python
In Python, there are two similarly-named functions, exit() and sys.exit() . What's the difference and when should I use one over the other?
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Difference between onCreate() and onStart()? [duplicate]
I was wondering - what is the difference between onCreate() and onStart() methods?
2 Answers
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Way to get number of digits in an int?
...ightly off. Note, though, that the compiler will complain due to a missing cast to int
– Dirk
Aug 20 '09 at 14:59
2
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What is the difference between char s[] and char *s?
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static char __unnamed[] = "abc";
char *c = __unnamed;
Note the implicit cast from char[] to char *, which is always legal.
Then if you modify c[0], you also modify __unnamed, which is UB.
This is documented at 6.4.5 "String literals":
5 In translation phase 7, a byte or code of value zero i...
How to grep a string in a directory and all its subdirectories? [duplicate]
How to grep a string or a text in a directory and all its subdirectories'files in LINUX ??
2 Answers
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What is the purpose of AsQueryable()?
... change the compile time type of the object to IQueryable. You could just cast it, but by having an AsQueryable method you can take advantage of type inference. This is simply more convenient if the generic argument list is complex, and it is actually necessary if any of the generic arguments are ...
How does Bluebird's util.toFastProperties function make an object's properties “fast”?
...;IsJSObject()) {
JSObject::OptimizeAsPrototype(Handle<JSObject>::cast(value));
}
Which in turn is called by FuntionSetPrototype which is what we get with .prototype =.
Doing __proto__ = or .setPrototypeOf would have also worked but these are ES6 functions and Bluebird runs on all browsers...
What's the difference between size_t and int in C++?
...G_PTR is an unsigned long type used for pointer precision. It is used when casting a pointer to a long type to perform pointer arithmetic.
This type is declared as follows:
typedef unsigned __int3264 ULONG_PTR;
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